Thermostatic expansion valve.

Important

Remove perforated section of heater and air conditioning evaporator module as one piece (it will be reused).
Water can leak onto carpeting when doing this procedure. It is recommended that a mat be placed on passenger side floor.

Using a small hand saw, remove perforated section of heater and air conditioning evaporator module.

Important

This piece of material is required to keep condensate from draining inside vehicle.

Slide evaporator (3) to the left, then pull out through the opening enlarged in step 11.

Install or Connect

Transfer condensate screen to new evaporator (3).
Install new evaporator core gasket in same position as original with appropriate adhesive.
Air conditioning evaporator (3) to heater and air conditioning module (11).

Insert evaporator (3) into module (It) through the opening enlarged during removal, slide to the right until fully seated.

Bolts/screws (41) to air conditioning evaporator (3).
Thermostatic expansion valve.
Apply sealer GM P/N 3012078 (do not use epoxy glue) between evaporator (3) and evaporator upper and lower case (44 and 45) just behind thermostatic expansion valve to prevent air entry from the engine compartment into the passenger compartment.
Position perforated section of heater and air conditioning evaporator module and use epoxy glue to adhere it to module. After epoxy dries, use thumb to grade sealant on inside and outside to ensure water-tight seal.
Temperature valve case (42).

Install from under instrument panel.
Slide case (42) upward into position until upper clip engages.
Engage snap on left edge of temperature valve case (42) to distributor case (46).